A 2020 astronaut photo shows three uniquely colored lakes — Tahoe, Walker and Mono — straddling contrasting biomes on either side of the California-Nevada border.

Researchers say the Arctic Ocean crossed a biological tipping point in 2009, when nitrate levels in the water suddenly started dropping due to a drastic reduction in sea ice extent.

There are two contenders for the world's deepest cave, and they're in the same mountain range.

The Ocean Observatories Initiative has been collecting data on physical, chemical, geological and biological conditions in the Atlantic and Pacific Oceans for the past decade

A June update by the European Centre for Medium-Range Weather Forecasts suggests that the coming weather event will be the strongest ever measured.

A volcano that erupted after being asleep for more than 100,000 years is leading more volcanologists to say we must redefine volcano activity to ensure eruptions don't surprise us.

Seeds from the last surviving wild Dendroseris neriifolia tree are now stored in Kew Gardens' Millennium Seed Bank as researchers work to find ways to reintroduce the species into the wild.

A new study finds mangrove forests are no longer shrinking worldwide, offering hope for coastal protection and climate resilience. But other research warns sea level rise could reduce their ability to store carbon.

A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt lake in the Bolivian Andes.

The Euphrates River fueled the "cradle of civilization," and a new study reveals the waterway was born of two other ancient rivers around 3.6 million years ago.

Iran is experiencing "water bankruptcy" that stems from decades of broken water governance and aggressive policies, and the current war is exacerbating the crisis.

Fingal's Cave is a hollow inside the Scottish island of Staffa that is characterized by massive, interlocking hexagonal columns of volcanic rock and astonishing acoustics.

Fires from March 7 airstrikes created a sulfur dioxide plume spanning 185,000 square miles.

Researchers have warned that the Thwaites Glacier, one of the largest glaciers in the world, is about to lose its eastern ice shelf. We spoke to marine geophysicist Robert Larter about what this means for the "Doomsday Glacier."

West Antarctica's "Doomsday Glacier" is on the brink of losing its ice shelf, further compromising the already melting ice mass and threatening to unleash devastating sea-level rises.

A 2015 satellite photo shows a series of golden tendrils surrounding Ghana's Lake Bosumtwi, which is considered sacred to the local Asante people. The lake and its surroundings were shaped by a massive meteor impact around 1 million years ago.